Boiler



C. DUOUENNE.

BolLER.

APPLICATION FILED APR. 11| 1919- 2 SHEETS-SHEET 1.

Hanf-ran BWM l c. DUQUENNE'.

BOILER.

1,41 Y APPLICATION FILED APR. H, 1919. Apr. 4

2 SHEETS-SHEET 2.

PATENT OFFICE.

CAMILLE DUQUENNE, 0F PARIS, FRANCE.

BOILER.

Application filed April 11, 1919.

To all tta/mm, 'it may concern.'

Be it known that 1, CAMILLE DUQUENNE, a citizen of the Republic ofFrance, and :t resident of 6 Rue dUlm, Paris, France, have invented newand useful Improvements in and Relating to Boilers, ot which thetollowing is a specification.

The present invention relates to a boiler of the type comprisingvaporizing elements each formed ot a group of straight tubes, verticalor almost vertical, secured at their extremities in collectors ofheaders, the up-A per header of each element being connected with thedrum of the boiler, and the lower header connected with the water-returncollector by means ot' nipples, which allow of very rapid mounting anddismounting.

The steam-boiler forming the subject ot the present invention ischaracterized by the fact that a longitudinal partition divides thesuperheating tubes and the greater part of the vaporizing tubes from thedirect action ofV the fire, this partition stopping at a certaindistance from the rear wall supporting the boiler, so that the productsof com bustion circulate from front to rear, first heating only thedirectly flame-licked tubes or tire-box tubes oi the vaporizing groups,and then coming round towards the front between this partition and thecorresponding outside lateral wall of the boiler casing and heating theother vaporizing tubes and the superheating tubes.

The annexed drawing shows by way oi' example one form of carrying outthe invention as applied to a marine boiler.

Figs. l and 1a show two halt sections transversely in different verticalplanes; Fig. 1 through a superheating element and Fig. lafthrough avaporizing element re-` spectively following line 1-1 and line. 1,-1aot' Fig. 2;

Fig. 2 shows diagrammatica'lly, on a smaller scale, a section throughline 2-9 of Figs. 1. and la'. v

The boiler consists of an upper drum` cz connected at each of itsextremities by two water-return tubes or downcomers al, al and o2, a2 totwo collectors or boxes b, b. The vaporizing elements are composed ofbanks or groups of straight tubes c, o very slightly inclined relativelyto the vertical, which are expanded at their extremities into headers orcollectors of square sections Z and e; the lower header d of each unitis connected with the corresponding water-return chamber orSpecification of Letters Patent.

Patented Apr. 4, 1922.

Serial No. 289,421.

box b by a nipple or pipe f having a coned metal-to-inetal joint, anova-l iange f1 slidable freely onthe pipe, ensuring the tastening bymeans of two bolts. The upper header c of each vaporizing element isalso connected with the drum L of the boiler by a nipple el ot' the samekind with two securing flanges e2, e2 connected by two bolts. Eachvaporizing element is thus dismountable by removing four bolts; theseelements are made to gauge or standardized in such a way as to beinterchangeable.

Opposite each open end of the tubes c, c, are arranged upon the headersCZ and c, screw plugs c1, c1, having metallo-plastic joints upon milledsurfaces permitting the cleaning or the replacing of each tube.

The superheating elements, shown on the left half of Fig. l and in Figs.2 and 3, comprise each a number of tubes g, the extremities of which areconnected to the front and rear parts ot' the corresponding upper headeror collector e3, which is for this purpose divided into two compartmentsby a partition et. The collecting header e3 for the tubes ofeachsuperheating element is bolted or otherwise connected to the uppercollecting header c of the corresponding vaporizer; in this portion ofthe bank ot' tubes, these vaporizing elements consist merely of thefire-box tubes 71, receiving the direct heat of the iiames andseparated'trom the superheater tubes g by a thin longitudinal parti tionof carborundum c' supporting` or resting upon the tubes lt; the same isthe case in the vaporizing elements, as shown in Fig. 1. Thesepartitions z', e' stop at a certain distance from the rear tace oil theboiler (see Figs. 2 and so that the combustion gases are passed from theiront to the rear oi' the boiler between these partitions i, e' which atthe rear allow the products of combustion to pass through breaks oropenings, the gases then coming around towards the front between thesepartitions and the exterior walls of the masonry or casing and cominginto contact with the tubular elements before escal'aing at the front bythe smoke flue. According to the location of the superheating elementsin the direction of the length of the boiler, the products of combustionwill act upon the superheating tubes g after having traversed a path ofvarying length, and while still at a more or less high temperature;after the boiler has been constructed, the degree of superheat can beregulated once for all according; to the working conditions of theboiler in each individual ease, by varying the location of thesesuperheating tubes g. This operation presents no diflieulty, since agroup of vaporizing tubes c as in Fig. l is simply replaced by a groupof superheating tubes gf, connected to a group ot' lire-box tubes it asin Fig. l, and vice versa; The lower part of the drum o, as well as theconnecting nipples of the upper headers e, are protected fromheat-radiations by lagging,f of asbestos or 'by earborunduui ittings j.

The Water and saturated or wet steam rises in the vaporizing tubes, andthe wet steam passes into the drum a Where the steamfis separated fromWater: the Water n descends by the return tubes or downcomers al, a2 atJfront and rear into the lower waterchambers or boxes ZJ, @whence itagain rises into the vaporizing elements, the fire-box tubes k beingfirst supplied. Y

At the lower part of the Water-return tubes are arranged two pockets Zat the bottom of which are the bottom drawoff coelrs. The Water feedtakes place into the front water-return tubes (1,1.

Steam collected into the drum av by a longitudinal pipe a3 perforated`With holes and arranged at the upper part of this drum makes' exit fromthis pipe by a steam Valve o4 and passes through the superheatingelements g,'whence it is afterwards sent into the main steam receiver;for this purpose the upper collectingrr header` e3 of each surperheatine,r elementis connected at one end to a steam intake manifoldg1 and at its other end to a superheated steam delivery `upper header tothe drum, downcorne-rs ron- 4necting the lower header of eachVapori'ainpj tube group with the drum, ,groups of superheating tubesextendingr over only a portion of the length of the boiler, an upperheader for each group of superheatingr tubes and extending over only aportion ofthe length of the headers for the vaporizing tubes, nieans forconnecting eaeh of said upper headers for the superheating tubes to theupper headers of the corresponding group of vaporizing tubes, alongitudinal Vpartition protecting the superheating tubes and thegreater part of the vapomzing tubes from the direct action of the fire,said partition stopping at a certain distance from the rear Wall of theboiler chamber, so that the products of combustion circulate from frontto rear, first heating` only the directly flame-heated tubes of the'vaporizing groups,` and then coming around toward the front betweenthis partition and the lateral wall of the boiler Chamber and thereheating the other raporizing tubes and the superheating tubes, 1 e Y Y2. A boiler comprising a drum arranged .in the upper portion thereof,upper and lower collecting headers, groups "of vaporizing tubesextending between and mounted in said headers, means for detaehablyconnecting,v the upper header of each group to the drum, downcomersdetachably connecting the lower header of each vaporizing tube Igroupwith the drum, groups of superheat- ,ing tubes extending over only aportion of the length of the boiler, an upper header for each group ofsuperheatinp: tubes and extending over only a portion of the length theheaders fory the vaporizingr tubes, means for detaehably connecting eachof said upper headers for the superheating tubes to the upper headers ofthe correspendingr group of vaporizing tubes, a lon- ,ojitudinalpartition protectingr the superheating tubes and the greater part of thevaporizino' tubes from the direct action of the lire, said partitionstopping at a certain distanee from the. rear Wall of the boilerchamber, so that the products of combustion circular., from 'trout torear, first heating only the directly tlame-heate l tubes of lthe,f'aporizingr groups, and then coming around toward the front betweenthis partition and the lateral Wall of the boiler chamber and thereheating,r the other vaporizingr tubes and the superheatino,r tubes.

ln testimony whereof l have signed my name to this specification.

CAMILLE DUQUENNE.

7i tnesses @Harmes Dorn', W. Dnrnvnniron'r.

